On 15/07/2025 2:35 pm, Yi Liu wrote: > Caution: External email. Do not open attachments or click links, unless > this email comes from a known sender and you know the content is safe. > > > On 2025/7/15 14:11, CLEMENT MATHIEU--DRIF wrote: >> >> >> On 14/07/2025 11:22 pm, Konstantin Belousov wrote: >>> Caution: External email. Do not open attachments or click links, >>> unless this email comes from a known sender and you know the content >>> is safe. >>> >>> >>> On Mon, Jul 14, 2025 at 05:41:22PM +0100, David Woodhouse wrote: >>>> On 14 July 2025 15:28:09 GMT+01:00, Yi Liu <yi.l....@intel.com> wrote: >>>>> Hi David, >>>>> >>>>> On 2025/7/14 16:00, David Woodhouse wrote: >>>>>> From: David Woodhouse <d...@amazon.co.uk> >>>>>> >>>>>> FreeBSD does both, and this appears to be perfectly valid. The VT-d >>>>>> spec even talks about the ordering (the status write should be done >>>>>> first, unsurprisingly). >> >> Are you talking about the ordering constraint mentioned in bullet >> "Page-request Drain (PD)"? > > David is talking about the IF and SW flags. And he is correct. Spec has > below sentence. It means a wait descriptor can have both IF and SW set > and indeed completion interrupt happens later than status write. Let's > go on refine the patch. :) > > "The invalidation completion event interrupt must push any in-flight > invalidation completion status > writes, including status writes that may have originated from the same > inv_wait_dsc for which the interrupt was generated."
Yep, I agree > > > Regards, > Yi Liu
